In masonry, it is a type of facing used on ancient Roman concrete or mortared rubblework walls. It appeared during the late Roman Republic and succeeded the earliest type of facing, an irregular patchwork called opus incertum. Reticulated work looks like a diagonal checkerboard with its square stones set lozenge fashion, separated by relatively fine joints. In porcelain production, it is a technique in which the outer side is entirely cut out in geometric patterns, honeycomb, circles intercrossed and superimposed to a second vase of similar or of cylindrical form.